Emitted on the drag source when a drag has failed.
The signal handler may handle a failed drag operation based on
the type of error. It should return %TRUE if the failure has been handled
and the default "drag operation failed" animation should not be shown.
Emitted on the drag source when a drag has failed.
The signal handler may handle a failed drag operation based on the type of error. It should return %TRUE if the failure has been handled and the default "drag operation failed" animation should not be shown.